Siemens SIMATIC S7 System Manual page 580
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105BCommunication processor
12.4 Universal serial interface (USS) communication
If the drive is configured as the terminating
node in the network, then termination and
bias resistors must also be wired to the
appropriate terminal connections. This
diagram shows examples of the MM4 drive
connections necessary for termination and
bias.
Setting up the MM4 drive
Before you connect a drive to the S7-1200, you must ensure that the drive has the following
system parameters. Use the keypad on the drive to set the parameters:
1. Reset the drive to factory settings (optional).
If you skip step 1, then ensure that these parameters are set to the indicated
values.
2. Enable the read/write access to all parameters (Expert mode).
3. Check the motor settings for your drive. The settings will vary according to
the motor(s) being used.
To set the parameters P304, P305, P307, P310, and P311, you must first set
parameter P010 to 1 (quick commissioning mode). When you are finished
setting the parameters, set parameter P010 to 0. Parameters P304, P305,
P307, P310, and P311 can only be changed in the quick commissioning
mode.
4. Set the local/remote control mode.
5. Set selection of frequency set-point to USS on COM link.
6. Ramp up time (optional)
This is the time in seconds that it takes the motor to accelerate to maximum
frequency.
7. Ramp down time (optional)
This the time in seconds that it takes the motor to decelerate to a complete
stop.
8. Set the serial link reference frequency:
9. Set the USS normalization:
580
MM420
P
14
120 ohm
N
15
470 ohm
0V
2
+10 V
1
MM440
P
29
120 ohm
N
30
470 ohm
2
0V
+10 V
1
P0010=30
P0970=1
USS PZD length = P2012 Index 0=(2, 4, 6,
or 8)
USS PKW length = P2013 Index 0=4
P0003=3
P0304 = Rated motor voltage (V)
P0305 = Rated motor current (A)
P0307 = Rated motor power (W)
P03010 = Rated motor frequency (Hz)
P0311 = Rated motor speed
P0700 Index 0=5
P1000 Index 0=5
P1120=(0 to 650.00)
P1121=(0 to 650.00)
P2000=(1 to 650 Hz)
P2009 Index 0=0
S7-1200 Programmable controller
System Manual, 11/2011, A5E02486680-05
1.5K ohm
1.5K ohm
- Quick Links:
- Introducing the S7-1200 Plc
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